steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
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MMPDS-01<br />
31 January 2003<br />
Figure 2.3.1.2.8(b). Best-fit S/N curves for notched, K t = 1.5, 4130 alloy <strong>steel</strong> sheet,<br />
normalized, longitudinal direction.<br />
Correlative Information for Figure 2.3.1.2.8(b)<br />
Product Form:<br />
Sheet, 0.075 inch thick<br />
Properties: TUS, ksi TYS, ksi Temp., EF<br />
117 99 RT<br />
(unnotched)<br />
123 -- RT<br />
(notched)<br />
K t 1.5<br />
Specimen Details: Edge Notched, K t = 1.5<br />
3.00 inches gross width<br />
1.50 inches net width<br />
0.76 inch notch radius<br />
Surface Condition:<br />
Reference:<br />
Electropolished<br />
3.2.3.1.8(d)<br />
Test Parameters:<br />
Loading - Axial<br />
Frequency - 1100-1500 cpm<br />
Temperature - RT<br />
Environment - Air<br />
No. of Heats/Lots: Not specified<br />
Equivalent Stress Equations:<br />
Log N f = 7.94-2.01 log (S eq - 61.3)<br />
S eq = S max (1-R) 0.88<br />
Std. Error of Estimate, Log (Life) = 0.27<br />
Standard Deviation, Log (Life) = 0.67<br />
R 2 = 84%<br />
Sample Size = 21<br />
[Caution: The equivalent stress model may<br />
provide unrealistic life predictions for stress<br />
ratios beyond those represented above.]<br />
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